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diff --git a/circuitpython/shared-bindings/alarm/time/TimeAlarm.c b/circuitpython/shared-bindings/alarm/time/TimeAlarm.c
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Dan Halbert for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/nlr.h"
+#include "py/obj.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+
+#include "shared-bindings/alarm/time/TimeAlarm.h"
+#include "shared-bindings/rtc/__init__.h"
+#include "shared-bindings/time/__init__.h"
+
+#include "supervisor/shared/translate.h"
+
+#if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
+mp_obj_t MP_WEAK rtc_get_time_source_time(void) {
+    mp_raise_RuntimeError(translate("RTC is not supported on this board"));
+}
+#endif
+
+//| class TimeAlarm:
+//|     """Trigger an alarm when the specified time is reached."""
+//|
+//|     def __init__(self, monotonic_time: Optional[float] = None, epoch_time: Optional[int] = None) -> None:
+//|         """Create an alarm that will be triggered when `time.monotonic()` would equal
+//|         ``monotonic_time``, or when `time.time()` would equal ``epoch_time``.
+//|         Only one of the two arguments can be given.
+//|         The alarm is not active until it is passed to an
+//|         `alarm`-enabling function, such as `alarm.light_sleep_until_alarms()` or
+//|         `alarm.exit_and_deep_sleep_until_alarms()`.
+//|
+//|         If the given time is in the past when sleep occurs, the alarm will be triggered
+//|         immediately.
+//|         """
+//|         ...
+//|
+STATIC mp_obj_t alarm_time_timealarm_make_new(const mp_obj_type_t *type,
+    size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
+    alarm_time_timealarm_obj_t *self = m_new_obj(alarm_time_timealarm_obj_t);
+    self->base.type = &alarm_time_timealarm_type;
+
+    enum { ARG_monotonic_time, ARG_epoch_time };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_monotonic_time, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
+        { MP_QSTR_epoch_time, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
+    };
+
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    bool have_monotonic = args[ARG_monotonic_time].u_obj != mp_const_none;
+    bool have_epoch = args[ARG_epoch_time].u_obj != mp_const_none;
+
+    if (!(have_monotonic ^ have_epoch)) {
+        mp_raise_ValueError(translate("Supply one of monotonic_time or epoch_time"));
+    }
+
+    mp_float_t monotonic_time = 0;   // To avoid compiler warning.
+    if (have_monotonic) {
+        monotonic_time = mp_obj_get_float(args[ARG_monotonic_time].u_obj);
+    }
+
+    mp_float_t monotonic_time_now = common_hal_time_monotonic_ms() / 1000.0;
+
+    if (have_epoch) {
+        #if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_NONE
+        mp_raise_ValueError(translate("epoch_time not supported on this board"));
+        #else
+        mp_uint_t epoch_time_secs = mp_obj_int_get_checked(args[ARG_epoch_time].u_obj);
+
+        timeutils_struct_time_t tm;
+        struct_time_to_tm(rtc_get_time_source_time(), &tm);
+        mp_uint_t epoch_secs_now = timeutils_seconds_since_epoch(tm.tm_year, tm.tm_mon, tm.tm_mday,
+            tm.tm_hour, tm.tm_min, tm.tm_sec);
+        // How far in the future (in secs) is the requested time?
+        mp_int_t epoch_diff = epoch_time_secs - epoch_secs_now;
+        // Convert it to a future monotonic time.
+        monotonic_time = monotonic_time_now + epoch_diff;
+        #endif
+    }
+
+    if (monotonic_time < monotonic_time_now) {
+        mp_raise_ValueError(translate("Time is in the past."));
+    }
+
+    common_hal_alarm_time_timealarm_construct(self, monotonic_time);
+
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|     monotonic_time: float
+//|     """When this time is reached, the alarm will trigger, based on the `time.monotonic()` clock.
+//|        The time may be given as ``epoch_time`` in the constructor, but it is returned
+//|        by this property only as a `time.monotonic()` time.
+//|        """
+//|
+STATIC mp_obj_t alarm_time_timealarm_obj_get_monotonic_time(mp_obj_t self_in) {
+    alarm_time_timealarm_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    return mp_obj_new_float(common_hal_alarm_time_timealarm_get_monotonic_time(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(alarm_time_timealarm_get_monotonic_time_obj, alarm_time_timealarm_obj_get_monotonic_time);
+
+MP_PROPERTY_GETTER(alarm_time_timealarm_monotonic_time_obj,
+    (mp_obj_t)&alarm_time_timealarm_get_monotonic_time_obj);
+
+STATIC const mp_rom_map_elem_t alarm_time_timealarm_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_monotonic_time), MP_ROM_PTR(&alarm_time_timealarm_monotonic_time_obj) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(alarm_time_timealarm_locals_dict, alarm_time_timealarm_locals_dict_table);
+
+const mp_obj_type_t alarm_time_timealarm_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_TimeAlarm,
+    .make_new = alarm_time_timealarm_make_new,
+    .locals_dict = (mp_obj_t)&alarm_time_timealarm_locals_dict,
+};